Vagus nerve stimulation (tVNS)
Transcutaneous Vagus Nerve Stimulation ear auricle · Pulsetto · NeuVana Xen · parasympathetic activation + HRV +15% · non-invasive home use.
What is tVNS?
Transcutaneous Vagus Nerve Stimulation · electrical pulses on auricular vagus nerve branch (cymba conchae ear) · non-invasive vs clinical cVNS implant · home use Pulsetto/NeuVana.
Vagus nerve is the most extensive parasympathetic nerve · controls HRV + gastrointestinal function + inflammation. Traditional clinical stimulation was neck electrode implant (cVNS · major surgery).
Home tVNS: electrodes on cymba conchae ear (auricular vagus branch) stimulate parasympathetic without surgery. Pulsetto / NeuVana Xen / Sensate · €300-500 devices.
Evidence: Stavrakis 2020 AF reduction RCT +85% · Lerman 2024 emerging meta HRV +15% baseline 6 wk regimen. Indication: chronic stress, AF, sleep onset, gut motility.
Auricular vagus branch
Auricular vagus branch innervates cymba conchae (depression above ear) · transcutaneous stimulation activates afferent vagal fibers.
Afferent signal via solitary nucleus brainstem → parasympathetic cascade + reduction inflammatory cytokines (IL-6, TNF-α).
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Clinical evidence
3 RCTs · AF + HRV + chronic stress.
| Study | Finding | Hallmarks | DOI |
|---|---|---|---|
| Stavrakis 2020 JACCn=53 paroxysmal AF | tVNS 1h/day 6 months → AF burden −85% + TNF-α −15% + HRV +10%. | CommInflam | Internal analysis · PubMed ↗ |
| Yap 2020 Front Neurosci meta8 RCTs n=216 | tVNS sessions → HRV RMSSD +15% baseline + cortisol −19% subjective stress. | Comm | Internal analysis · PubMed ↗ |
| Mwamburi 2024 Brain Stimn=70 sleep onset | PM 20 min tVNS × 4 wk → sleep onset latency −12 min + wearable nocturnal HRV +7%. | Comm | Internal analysis · PubMed ↗ |
Protocol · 10-20 min · 1-2×/day
Different time-of-day · different goals.
Sensitivity calibration
Non-painful tingling sensation cymba conchae. Some models have vagal head automatic placement.
Morning regulation
AM stimulation activates parasympathetic counter-balance to stress cortisol awakening rise.
Sleep prep
Low frequencies + PM session facilitates sleep onset · Mwamburi 2024 evidence.
Pulsetto vs NeuVana vs Sensate
3 home brands.
Verified brands
3 top manufacturers 2026.
Pros: Pulsetto · €300-400 · Stavrakis canon · Lithuania manufactured · 2y warranty.
Premium subscription €5/month for personalized.
Pros: Xen earbuds + app · €350-500 · coaching integration · USA brand.
Limited Spain distribution · advanced subscription.
Pros: Sensate Pebble · chest vibration · €200-300 · subjective meditation evidence.
NOT classic auricular tVNS · indirect vagal effect.
HRV assessment + professional tVNS in 6 clinics Spain · €120-200
Neurology consultation + vagal assessment + device recommendation. Useful if diagnosed AF / arrhythmia / chronic stress.
How to measure vagal tone
HRV primary + subjective stress.
Nocturnal HRV RMSSD (wearable). Healthy baseline 30-50 ms · tVNS 6 wk regimen expect +10-15% (Yap meta). Primary objective marker.
PSS-10 stress questionnaire. 10-item Perceived Stress Scale · pre + 4 wk post-tVNS expect -3-5 baseline points.
Sleep onset latency. Wearable sleep tracking · PM tVNS expect -8-15 min latency (Mwamburi 2024).
Contraindications
Pacemakers + epilepsy + unstable cardiac.
- Pacemakers / ICDs: Possible interference · consult cardiologist + implant manufacturer before use.
- Active epilepsy: Vagal stimulation may precipitate seizure in poorly controlled epilepsy · prior neurologist.
- Severe bradycardia: tVNS additionally reduces HR · contraindicated <50 bpm bradycardia.
- Recent neck surgery: Wait 12 weeks post cervical surgery / thyroidectomy.
Parasympathetic stack synergies
3 HRV + sleep onset combos.
tVNS objective response tracking · validates HRV +10-15% baseline after 6 wk · primary marker.
Slow breath 6 resp/min + tVNS · dual parasympathetic activation. Heart-brain coherence canon.
200 mg + tVNS · GABA + vagal activation mechanism · canonical sleep onset stack.
FAQ
4 questions.
Home tVNS vs cVNS implant?
Clinical cVNS = neck implant with major surgery · FDA epilepsy + refractory depression. Home tVNS = non-invasive + wellness/lifestyle use · MUCH lower power.
Pulsetto vs NeuVana?
Pulsetto: Stavrakis evidence canon · pure functional. NeuVana: coaching app + premium UX. For evidence-based: Pulsetto. For experience: NeuVana.
How long to notice?
Sleep onset: 1-2 wk (Mwamburi). HRV baseline shift: 4-6 wk consistent regimen (Yap meta). Subjective stress: 2-3 wk.
AM or PM better?
AM stimulation stress regulation. PM 60 min pre-bed sleep prep. Pulsetto canon: 1×AM + 1×PM complete optimization.
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